Lights Out Cities go dark as world turns off power for Earth Hour CCTV ...

This weekend marks the annual event known as Earth Hour. It's one hour where people are urged to turn off their lights in an effort to show environmental awareness. CCTV reporter Jeff Napshin has more from Washington DC on this growing movement.

It's one of the most famous landmarks in a city known for them. But this weekend Washington's National Cathedral will go dark when the lights turn off in celebration of Earth Hour.